Vol. 105, No. 1 (https://doi.org/10.62550/RI0310501)

Healthy Nile tilapia and red tilapia. Tilapia is a cheap source of protein. However, diseases caused by viruses such as the Tilapia Lake Virus (TiLV) can affect the culture of this fish. Logronio et al. (2022) studied the genetic diversity of TiLV detected in the country based on sequencing data. Identification of the three phylogenetic groups of the virus has significant implications for tilapia disease diagnostics, vaccine development, and selective breeding of disease resistant tilapia stocks. {Photograph courtesy of Dr. Ma. Rowena Eguia, Binangonan Freshwater Station, Southeast Asian Fisheries Development Center/ Aquaculture Department (SEAFDEC/AQD)}

Articles

Concentrations of Digestible, Metabolizable and Net Energy in Coconut Co-products Fed to Growing Pigs

Ronilo O. De Castro, Satoshi Ohkura, Akemi Yamamoto, Yasuhiro Morita, Analyn P. Pudua, and Rommel C. Sulabo

Received: January 16, 2019/ Revised: October 19, 2021/ Accepted: February 14, 2022 (https://doi.org/10.62550/AEF002023)

This experiment was conducted to determine the concentration of digestible (DE), metabolizable (ME), and net energy (NE), and to develop prediction equations for DE and ME in coconut co-products (CCP) fed to growing pigs. The CCP used were copra meal (CM), protein enriched copra meal (PECM), and white copra (WC) obtained from the different sources in the Philippines. Twenty-two growing barrows (PIC L337 × C24; initial BW 18.74 ± 0.91 kg) were individually housed in metabolism cages that allowed for a total but separated collection of feces and urine. Pigs were arranged in a replicated 11 × 3 Youden square design with 11 dietary treatments at three periods each. A basal diet that contained...

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Effects of Methyl Salicylate (MeSA) on the Physiology and Biochemical Characteristics of Rice Under Salinity Stress at Seedling Stage

Pham Thi Thu Ha, Truong Minh Tuan, Pham Thi Thu Hien, Tran Thi My Hiep, and Chau Thi Da

Received: June 28, 2021/ Revised: December 14, 2021/ Accepted: January 15, 2022 (https://doi.org/10.62550/FD073021)

Salt stress negatively affects crop survival, growth, development, and yield. Methyl salicylate (MeSA) is synthesized from salicylic acid (SA) which is a volatile organic compound that is responsible for inducing defense mechanisms in plants and also has a protective role in stress sensitivity. The objective of this study was to examine the effect of different concentrations of methyl salicylate (MeSA) on the physiological and biochemical characteristics of two rice varieties GRIS4 (G1) and GRIS5 (G2) under salt stress at the seedling stage. Five hundred seeds of each variety were treated with different doses of MeSA (0, 0.1, 0.5, and 1.0 mM) and screening various salinity levels (0, 6, 8...

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Modeling the Dynamics of Soil Organic Matter Accumulation from Leaf Litterfall as Affected by Tillage Practices in Mango Orchard

Fernan T. Fiegalan, Cherry L. Ringor, and Tolentino B. Moya

Received: November 13, 2020/ Revised: January 25, 2022/ Accepted: January 27, 2022 (https://doi.org/10.62550/KS116020)

This study was undertaken to determine long-term soil organic matter (SOM) accumulation dynamics from added mango leaf litter (MLL) into tilled (MT) and non-tilled soil (MnT) through integrated field experiment (bio-physico-chemical edaphic properties) and system dynamics modeling. Field data shows that the coarse (Lf) and fine (Fn) fractions of SOM have no significant difference (p > 0.05) between MT and MnT during the dry season. In contrast, there is a significant difference (p < 0.01) in the Fn fraction between MT and MnT during the wet season. The total N, available P, exchangeable K, as well as the collembola, bacteria, and fungi in the soil were also assessed. Of these parame...

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Effect of Plant Growth Promoting Rhizobacteria and Rhizofungus on the Growth of Hairy Basil (Ocimum basilicum L.f. var. citratum Back.)

Nuntavun Riddech, Tiptida Kidtook, Natthawat Sritongon, and Jindarat Ekprasert

Received: November 26, 2020/ Revised: December 17, 2021/ Accepted: February 15, 2022 (https://doi.org/10.62550/KF118020)

In this study, plant growth promoting rhizobacteria (PGPR) and plant growth promoting fungi (PGPF) were isolated from soil adhered to the roots of herbs. PGPR and PGPF isolates were selected for producing microbial inoculant as a starter culture for bio-fertilizer production. The screening of PGPR and PGPF was performed using the spread plate technique on the selected medium. Total plant growth promoting microorganisms (PGPM) were composed of 72 isolates, nitrogen-fixing microorganisms: 39 isolates, phosphate-solubilizing: 11 isolates, and potassium-solubilizing: 22 isolates. Two bacterial isolates, S-K7-2 and S-P7-1, had the highest plant growth promoting abilities, and a fungus isolate,...

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Morpho-Physiological Responses of Wheat to Silicon and Bio-Fertilizer under Water-Deficit Conditions

Mehrdad Arab-Aval and Hamid Reza Ganjali

Received: May 20, 2021/ Revised: December 7, 2021/ Accepted: January 15, 2022 (https://doi.org/10.62550/EL058021)

Recently, the use of silicon and bio-fertilizer has become important worldwide to improve the physicochemical characteristics of soil. Thus, they are used as an alternative approach to cope with the water-deficit stress on wheat plant. In this regard, a split-plot factorial experiment based on randomized complete block design with three replications was conducted during 2017 and 2018 at Sistan and Baluchestan Research Station, Iran. In the present study, treatments included water-deficit stress (irrigation after 60, 120, and 180 mm of evaporation from Class A pan) as the main plot, as well as the application of silicic acid (Si) foliar nutrition (0, 1, and 1.5 mM) and Nitro-Kara bio-ferti...

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